Tread portion of an automobile tire



FIG. 1 is a front view of a tread portion of an automobile tire according to the present invention;

FIG. 2 is a perspective view thereof;

FIG. 3 is a right side view thereof; and,

FIG. 4 is a fragmentary enlarged view showing the details of the tread portion thereof.

The evenly-spaced broken lines shown in the drawings are for the purpose of showing environmental structure only and form no part of the claimed design. The dashed-dotted broken lines in the drawings are used to show the boundary between claimed and unclaimed subject matter and form no part of the claimed design. 

CLAIM The ornamental design for a tread portion of an automobile tire, as shown and described. 